The extension of a spring, l cm varies directly as the mass, w g attached to the spring. If a mass of
10 g produces an extension of 2.8 cm, find
(a) the extension produced by a mass of 18 g,
(b) the mass which would produce an extension
of 21 cm.

good job you smart son of a gun you are smarter that einstein. 7

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.